Pacific Microsonics HDCD Model Two User Manual page 23

Setup & Operation
23
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Model Two HDCD User's Manual
DD88-176 Mode
In DD88-176 Mode, the Model Two performs 88.2 kHz to 176.4 kHz sampling frequency
conversion using high resolution HDCD interpolation filtering. Selectable, two-wire, stan-
dard speed, or single wire, double speed AES signal formats are used for the 88.2 kHz
stereo input signal (SETUP/INPUT/FORMAT/1_WIRE or 2_WIRE). When two wire is selected,
digital input 1 is channel 1, and digital input 2 is channel 2. The 176.4 kHz output word
length is selectable between HDCD 24, 20, or 16-bit. A two-wire, double speed AES signal
format is used for the 176.4 kHz stereo output signal. Digital output 1 is channel 1, and
digital output 2 is channel 2. Between +6 and -25.9 dB of signal level adjustment is
available using DSP gain in the Levels Menu (LEVELS/DSPGAIN). Factory Preset: DD2X-4X.
DD44-176 Mode
In DD44-176 Mode, the Model Two performs 44.1 kHz to 176.4 kHz sampling frequency
conversion using high resolution HDCD interpolation filtering. The 44.1 kHz input accepts
24-bit, 20-bit, 16-bit, or 16-bit HDCD signals, with HDCD 16-bit amplitude decoding and
gain scaling available. The 176.4 kHz output word length is selectable between HDCD 24,
20, or 16-bit. Monitoring the 176.4 kHz output in DD44-176 Mode provides greatly en-
hanced D/A conversion accuracy for 44.1 kHz signals, and is excellent for converting 44.1
kHz sources such as DAT's for analog processing during mastering. The 176.4 kHz output
word length is selectable between HDCD 24, 20, or 16-bit. A two-wire, double speed AES
signal format is used for the 176.4 kHz stereo output signal. Digital output 1 is channel 1,
and digital output 2 is channel 2. Between +6 and -25.9 dB of signal level adjustment is
available using DSP gain in the Levels Menu (LEVELS/DSPGAIN). Factory Preset: DD1X-4X.
CAUTION: If a standard STEREO 44.1 kHz AES signal is connected to either of the
digital inputs when the Model Two is set up for AES two wire input in AD_88.2, DD88-
44, DD88-88 or DD88-176 Modes, supersonic spurious energy will appear at the D/A
converter analog ouputs which may damage loudspeakers.
CAUTION: Whenever a 24-bit output word length is selected, it is essential to verify
that the equipment the signal is fed to will pass or process a 24-bit signal without
truncation. When in doubt, it is better to select a 20-bit output word length. An
intact 20-bit signal will sound better than a truncated 24-bit signal.
Output word length is set in the Digital Output 1 and 2 Menus (SETUP/OUTPUT/OUT_1 or
OUT_2).
NOTE: When multiple Model Twos are used for multichannel A/D conversion, the A/D
reference clocks must be locked together. See Page 53 for set up information.
P A C I F I C M I C R O S O N I C S I N C .
Rev. C - January 2002
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